Door latch



E3, 1932. w. R. SCHLAGE 1,846,364

DOOR LATCH Filed June 18, 1928 2 Sheets-Sheet 1 A TORNEYS.

Feb. 23, 1932.

W. R. SCHLAGE DOOR LATCH Filed June 18, 1928 2 Sheets-Sheet 2 jnwiwfi INVENTO rid M A TTORNEYS.

Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE 'Wfilll-TER It. SOHIIAGE, OF SAN FRANGISCD,

CALIFORNIA, ASSIGNOR TO SCHLAGE LOCK UDMPAJN'Y, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

DOOR LATCH Application filed June 18,

This invention relates to door latches such as shown in my co-pending application entitled Door latch filed April 18, 1928, Serial Number 270,815 and especially to an improvement thereon whereby the latch bolt may be changed to operate as a dead bolt.

The object of the present invention is to generally improve and simplify the construction and operation of door latches of the character described, and especially to provide an improved form of mechanism whereby the latch bolt may be substituted by a dead bolt, and further to provide a dead locking lever whereby the dead bolt is dead locked against forcible retraction bya tool such as a immy or the like inserted between the door and the jamb.

The invention is shown tration in the which:

Fig. 1 is a bolt unit,

Fig. 2 is a perspective view of the dead bolt actuating unit,

b Fig. 3 is a perspective view of the dead olt,

Fig. i is a perspective view of the dead bolt retractor bar,

Fig. 5 is a perspective view of the dead bolt locking lever,

Fig. 6 is a perspective view of the retractor crank arms,

Fig. 'l is a perspective view of the anchor late P Fig". 8 is a central longitudinal vertical section of the two units assembled, said section also showing a portion of the door,

9 is a longitudinal plan section taken through a ortion of thedoor and showing assembly oi the two units.

Referring to the drawings in detail, and particularly to Figs. 1, 2, 8 and 9, A indicates in general the dead bolt actuating unit, and B the dead bolt unit. These units are assembled in the door as shown in Fig. 9, by drilling or boring two holes therein, one hole by way of illusaccompanying drawings, in

perspective view of the dead transversely through the door as indicated at O, to receive the dead bolt actuating unit, and a second hole such as indicated at D, which is drilled through the edge of the door 1928. Serial No. 286,079.

2 and 9. This unit may be key or'knob actu-- ated, or both. It is provided with a flat spindle bar 2, which in this instance is connected to the key actuated unit, as shown in Fig. 2 at one end, and by a knob 3 at the opposite end, into which it extends. The key actuated unit, together with the knob 3, constitutes the dead bolt actuating mechanism.

The key actuated unit consists of a c linder 4, provided with an exterior escutc eon or face plate 5. Mounted interiorly of the cylinder is the usual cylinder plug and tumblers and secured to the outer end of the cylinder plug is a cam plate 6, which may be r0- tated when a key 7, is inserted, as shown in Fig. 9. The spindle bar 2 is connected to the cam plate so that it will rotate in unison with the key and c linder plug.

The particu ar connection employed by the cam plate and the spindle bar is of no importance, as it is described and claimed in detail in the co-pending application previously referred to.

The key actuated unit is provided with two posts or extension rods 8 and 9, the outer ends of which are drilled and tapped as indicated at 10 to receive securing screws'll. These screws pass through an interior escutcheon plate 12, in which the inner knob 3 is journaled, the shank of this knob being provided with a recess as previously described, to receive the inner knob of the spindle bar 2, so that the spindle may be rotated either by the key actuated mechanism or by the knob 3.

The screws 11 secure the dead bolt actuating mechanism, with the key actuated mechanism and the inner escutcheon plate and knob 3, against removal and it also secures the dead bolt unit against removal as will hereinafter be described.

The dead bolt unit is best illustrated in Figs. 1, 3, 4, 5, 6, 7, 8 and 9. It consists of a face or guide plate 14, which is secured to the outer edge of the door in the usual man ner, or as indicated by screws 15. Suitably secured to the rear side of the guide late 14 is an elongated cylindrical shaped ousing guide opening 23. The outer end of the dead B. The inner end of the housing is closed by an end plate 16, and a reinforcing late 16a. Secured to this end plate'is an anc or plate 17, see Figs. 7, 8 and 9. This anchor plate is 5 disposed in alignment with the longitudinal axis of the housing B, and forms an extension thereof, the inner end of the anchor plate being riveted or otherwise secured to the end plates 16 and 16a in any suitable manner.

The outer end of the anchor plate is provided with a notch 18 and the inner end with aperforationl). TheperforationlQsli sover the rod 8 when the two units areassem led in a door, as shown is Fig. 9 while the notch 18 slides along a rod 9. An interlock is thus formed between the housing of the dead bolt unit and the dead bolt actuating unit, and this interlock also maintains a definite relation "between thecooperating parts of the mecha-,-

nism employed.

Slidablv mounted in the outer end of the housin B and guided by the face plate 14 is the ead bolt proper. This is indicated at 20. It is best illustrated in Figs. 3, 8 and 9.

Secured to the inner end of the dead bolt, as by a rivet or the like, indicated at 21, is aretractor bar 22. This bar is best illustrated in Figs. 4, 8 and 9. The inner end of the retractor bar extends through an opening 23 formed in the end plates 16 and 16a, this opening serving as a guide for the inner end of the retractor bar. The inner end of the retractor bar is notched as indicated at 24, and this notch permits a certain amount of free movement of the retractor pin, hereinafter to be described.

Pivotally secured, as at 25 to one side of the retractor bar, is a dead locking bar 26. This bar lies parallel with the retractor bar 22 and its inner end extends through the locking bar is bent over to overlie the retractor bar, and to form a pin 27, and a spring 28, see Fig. 8, is interposed between this pin and a shoulder 29, formed on the retractor bar. The function of the spring just referred to will hereinafter be described.

The inner end of the dead locking bar is turnedat right angles, as shown at 30, to over lie the anchor plate 17. On this anchor plate is formed a stop shoulder 32, and by referring to Fig. 8 it will be noted that the right angular bent inner end 30 of the dead locking link normally engages the shoulder 32, there- 0 by locking the deadbolt 20 against retraction when pressure is exerted on the outer end.

The retractor proper is actuated either by the key mechanism, or by the inner knob 3. It consists of a pair of crank arms 40, tied together at their lower ends as indicated at 41. The crank arms are slotted as indicated at 42, to permit the spindle bar 2 to pass therethrough and the crank arms are also provided with a crank pin 43, which will hereinafter '75 be referred to as the retractor pin.

When the dead locking bolt is extended, as shown in Figs. 8 and 9, the spindle bar, together with the; crank arms 40 and the retractor pin 43 normally assume the position there shown. The inner end of the pivotally mounted dead locking bar will in that instance rest directly on top of the retractor pin, but it will nevertheless assume a sufiiciently depressed position so that the inner right angular bent end 30 will engage the' stop shoulder 32 of the anchor plate. In this position it' will be impossible to depress the dead bolt 20 by means of a jimmy or a like tool, as the dead locking link assumes its dead locking position.

The dead bolt is, however, free to be retracted, either by the key actuated mechanism or the inner knob 3, as either one will im art a rotary motionto the spindle bar 2. hen the spindle bar is rotated in the direction of arrow a, see Fig. 8, the crank arms, together with the retractor pin 43 will move in the same direction, The pin 43 will first raise the inner end of the dead locking bar, thus freeing it with relation to the shoulder 32 Next, the retractor pin will engage the upper end of the notch 24 in the retractor bar, and during the remaining movement it will engage the side wall 24a of the notch, and thus pull the retractor bar, together with the dead bolt 20, inwardly.

\Vhen completely retracted, the ri 'ht angular bent end 30 of the dead locking bar rests behind a lug 32a, formed on the anchor plate, it being held there by the pressure of the spring 29, this being important as the dead locking lever then serves as a spring latch to retain the dead locking bolt in its retracted position.

Upon reverse movement of the spindle bar, the dead -bolt is projected to the position shown in Fig. 8, and as the spindle bar reaches the end of its turning movement, the dead locking bar is lowered into engagement with the stop shoulder 32, thus dead locking the dead bolt in its extended or projected position.

While certain features of the present invention are more or less specifically described,

I wish it understood that various changes may be resorted to within the scope of the appended claims,similarly that the materials and finishes of the several parts employed may be such as the manufacturer may decide or varying conditions or uses may demand.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a door latch of the character described, a dead bolt, a retractor bar connected therewith, a retractor engageable with the retractor bar .and adapted to project or retract the dead bolt, an anchor plate, a front and a rear retaining shoulder formed thereon, a dead locking lever pivotally secured at its outer end to the dead bolt, the inner end of said dead locking lever being spring depressed and normally engaging the outer retaining shoulder on the anchor plate when the dead bolt is projected, means actuated by the retractor for raising the inner end of the dead locking lever with relation to the outer retaining shoulder and for retracting the A dead bolt, the retractor bar and the dead locking lever, the inner end of the dead locking lever adapted to engage the inner retaining shoulder, when the dead bolt is retracted to retain the dead bolt in its retracted position.

2. In a door latch of the character described a dead bolt, an elongated housing in which the dead bolt is reciprocally mounted, said housing being slotted at its inner end, a retractor bar connected with the dead bolt and extending through and guided by the slotted end of the housing, a retractor engageable with the retractor bar and adapted to project or retract the dead bolt, a dead locking lever pivotally connected at one end to the dead bolt, the opposite end of said lever extending through and being guided by the slotted end of the housing, a lug formed on the inner end. of the dead locking lever, a stop shoulder, and spring actuated means normally maintaining the lug on the dead looking lever in engagement with the stop shoulder when the dead bolt is projected.

3. In a door latch of the character described a dead bolt, an elongated housing in which the dead bolt is reciprocally mounted, said housing being slotted at its inner end, if retractor bar connected with the dead bolt and extending through and guided by the slotted end of the housing, a retractor engageable with the retractor bar and adapted to project or retract the dead bolt, a dead locking lever pivotally connected at one end to the dead bolt, the opposite end of said lever extending through and being guided by the slotted end of the housing, a lug formed on the inner end of the dead locking lever, a stop shoulder, spring actuated means normally maintaining the lug on the dead locking lever in engagement with the stop shoulder when the dead bolt is projected, and

means actuated by the retractor for elevating the lug end of the dead locking lever with relation to the stop shoulder so as to render the dead locking lever inoperative when the dead bolt is to be retracted by the retractor.

4. In a. door latch of the character described a dead bolt, an elongated housing in which the dead bolt is reciprocally mounted. said housing being slotted at its inner end, a retractor bar connected with the dead bolt and extending through and guided by the slotted end of the housing, a retractor engageable with the retractor bar and adapted to ,project or retract the dead bolt, a dead locking lever pivotally connected at one end to the dead bolt, the opposite end ofsaid lever'extending through and being guided by the slotted end of t e housing, an anchor p ate on the inner end of the housing, a retainin shoulder formed thereon, the inner end 0? the dead locking lever normally engaging said shoulder and dead locking the dead bolt when projected, means actuated by the retractor for raisin the inner end of the locking lever with relatlon to the shoulder on the anchor plate and for retracting thedea-d (5 bolt, and a spring co-operating with'the dead locking lever and normally retaining it in engagement with the retaining shoulder to secure the dead bolt in its promoted position.

WALTE R. SCHLAGE. 

